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From: Curtis Call (curtiscallUSA.NET)
Date: Tue Jul 03 2001 - 10:18:08 CDT

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    I have a Question about the DR Election procedure as detailed in RFC 2328
    Section 9.4. The fourth step of the process specifies that if the router
    performing the procedure has been elected as BDR or DR, or lost it's position
    as such that it should repeat the process once more in order to ensure that it
    does not advertise itself as both the BDR and the DR. My question is, why is
    this not done by other routers as well in order to keep them from believing
    that the DR and the BDR are the same?

    For instance, if router X, determines that router Y is the BDR, and then
    promotes it to be the DR as well, why is there not an immediate check to redo
    the BDR election? Is the reason this isn't considered necessary due to the
    fact that router Y will go through the election procedure again and will pick
    a new BDR so it's hello packets will cause router X to generate a
    NeighborChange event and recalculate the BDR and DR?

    Thanks.